Module 3: Wireless and Mobile Networks Flashcards
In addition to the GSM and 4G/5G transmitters and receivers, smartphones make connections in a variety of ways.
List the other ways:
- GPS
- WiFi
- Bluetooth
- NFC
How does GPS (Global Positioning System) work?
The GPS uses satellite signals that cover the globe. The smartphone can receive the signals and calculate the distance to an accurancy within 10 meters.
How does WiFi work?
Wi-Fi transmitters and receivers located within the smartphone enable the phone to connect to local networks and the internet.
What’s the requirement for a phone to receive or send data on a WiFi network?
The phones needs to be in range of the signal of the wireless access point.
What is Bluetooth?
Bluetooth is a low-power, shorter range wireless technology that is intended to replace wired connectivity for accessories such as speakers, headphones, and microphones.
Bluetooth can also be used to connect a smartwatch to a smartphone. Because Bluetooth technology can be used to transmit both data and voice, it can be used to create small local networks. Bluetooth is wireless technology that allows devices to communicate over short distances. Multiple devices can be connected at the same time with Bluetooth.
What is NFC (Near Field Communication)?
Near Field Communication (NFC) is a wireless communication technology that enables data to be exchanged by devices that are in very close proximity to each other, usually less than a few centimeters.
For example, NFC can be used to connect a smartphone and a payment system. NFC uses electromagnetic fields to transmit data.
What is is advisable to connect to a WiFi connection when possible?
Because:
* Data used over WiFi doesn’t count on the celullar data plan.
* Uses less battery than cellular, because the WiFi radios use less power
What safety measures can be taken when using a WiFi?
- Never send login or password information using plaintext (unencrypted)
- Use VPN when possible when sending sensitive data
- Enable security on home networks
- Use WPA2 or higher encryption for security
How to configure Mofile WiFi connectivity
- If your mobile device does not prompt to connect to a Wi-Fi network, the network SSID broadcast may be turned off, or the device may not be set to connect automatically.
- Manually configure the Wi-Fi settings on the mobile device.
- Remember that SSIDs and passphrases must be typed exactly as entered on the wireless router setup or the device will not connect properly
SSID is the name assigned to a wireless network. Passphrase is what we normally use as the “wireless password”
Cable connections are not always practical when connecting headsets or speakers.
What is the alternative and why?
Bluetooth, because it’s:
* wireless
* automatic, and
* uses very little power
How many Bluetooth devices can be connected at the same time?
8
Bluetooth pairing occurs when two Bluetooth devices establish a connection to share resources.
How to pair these devices?
- the Bluetooth radios are turned on, and one device begins searching for other devices.
- Other devices must be set to discoverable mode, also called visible, so that they can be detected.
- When a Bluetooth device is in discoverable mode, it transmits the following information when another Bluetooth device requests it:
* Name
* Bluetooth class
* Services that it can use
* Technical information
During the pairing process, a personal identification number (PIN) may be requested to authenticate the pairing process. The PIN is often a number, but can also be a numeric code or passkey. The PIN is stored using pairing services, so it does not have to be entered the next time the device tries to connect. This is convenient when using a headset with a smart phone, because they are paired automatically when the headset is turned on and within range.
